- package com.sun.org.apache.bcel.internal.generic;
-
- /* ====================================================================
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2001 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Apache" and "Apache Software Foundation" and
- * "Apache BCEL" must not be used to endorse or promote products
- * derived from this software without prior written permission. For
- * written permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * "Apache BCEL", nor may "Apache" appear in their name, without
- * prior written permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
-
- /**
- * Super class for JSR - Jump to subroutine
- *
- * @version $Id: JsrInstruction.java,v 1.1.1.1 2001/10/29 20:00:20 jvanzyl Exp $
- * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
- */
- public abstract class JsrInstruction extends BranchInstruction
- implements UnconditionalBranch, TypedInstruction, StackProducer
- {
- JsrInstruction(short opcode, InstructionHandle target) {
- super(opcode, target);
- }
-
- /**
- * Empty constructor needed for the Class.newInstance() statement in
- * Instruction.readInstruction(). Not to be used otherwise.
- */
- JsrInstruction(){}
-
- /** @return return address type
- */
- public Type getType(ConstantPoolGen cp) {
- return new ReturnaddressType(physicalSuccessor());
- }
-
-
- /**
- * Returns an InstructionHandle to the physical successor
- * of this JsrInstruction. <B>For this method to work,
- * this JsrInstruction object must not be shared between
- * multiple InstructionHandle objects!</B>
- * Formally, there must not be InstructionHandle objects
- * i, j where i != j and i.getInstruction() == this ==
- * j.getInstruction().
- * @return an InstructionHandle to the "next" instruction that
- * will be executed when RETurned from a subroutine.
- */
- public InstructionHandle physicalSuccessor(){
- InstructionHandle ih = this.target;
-
- // Rewind!
- while(ih.getPrev() != null)
- ih = ih.getPrev();
-
- // Find the handle for "this" JsrInstruction object.
- while(ih.getInstruction() != this)
- ih = ih.getNext();
-
- InstructionHandle toThis = ih;
-
- while(ih != null){
- ih = ih.getNext();
- if ((ih != null) && (ih.getInstruction() == this))
- throw new RuntimeException("physicalSuccessor() called on a shared JsrInstruction.");
- }
-
- // Return the physical successor
- return toThis.getNext();
- }
- }